edited by Robert C. Tasker, Robert J. McClure, Carlo L. Acerini
Oxford University Press, 2009
Buku Referensi
Oxford University Press, 2005
Buku Teks
edited by Robert Baldwin, Martin Cave, Martin Lodge
Oxford University Press, 2013
Buku Teks
edited by Niamh Moloney, Eilis Ferran; Jennifer Payne
Oxford University Press, 2015
Buku Teks
Mitchell, David A., author
Oxford University Press, 2014
Buku Referensi